Rectangular array T(n,k) = binomial(n,2)*k*n^(k-1) read by antidiagonals.

Terms

a(0) =1a(1) =4a(2) =3a(3) =12a(4) =18a(5) =6a(6) =32a(7) =81a(8) =48a(9) =10a(10) =80a(11) =324a(12) =288a(13) =100a(14) =15a(15) =192a(16) =1215a(17) =1536a(18) =750a(19) =180a(20) =21a(21) =448a(22) =4374a(23) =7680a(24) =5000a(25) =1620a(26) =294a(27) =28a(28) =1024a(29) =15309